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PHP Build a Basic PHP Website (2018) Listing and Sorting Inventory Items Array Keys

Ken LaRose
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.a{fill-rule:evenodd;}techdegree
Ken LaRose
Python Web Development Techdegree Student 21,982 Points

Is this not a valid solution? It works in Workspaces, but I can't get through the code challenge.

I'm supposed to set a temporary variable named $isbn to the key value of the $books array.

I tried with $isbn as a String, or with $isbn as an array (code example is the String version) ...but I keep getting the bummer message. Anybody see what's wrong with this?

index.php
<?php

$books["978-0743261690"] = "Gilgamesh";
$books["978-0060931957"] = "The Odyssey";
$books["978-0192840509"] = "Aesop's Fables";
$books["978-0520227040"] = "Mahabharta";
$books["978-0393320978"] = "Beowulf";

?><html>
<head>
    <title>Five Great Books</title>
</head>
<body>
    <h1>Five Great Books</h1>
    <ul>
        <?php foreach($books as $id => $book) { 
            $isbn = $id;?>
            <li><?php echo $book; ?></li>
        <?php } ?>
    </ul>
</body>
</html>

Hey ken, here in this code challenge you only have to loop through $books and echo both key and value.

<?php

$books["978-0743261690"] = "Gilgamesh";
$books["978-0060931957"] = "The Odyssey";
$books["978-0192840509"] = "Aesop's Fables";
$books["978-0520227040"] = "Mahabharta";
$books["978-0393320978"] = "Beowulf";

?><html>
<head>
    <title>Five Great Books</title>
</head>
<body>
    <h1>Five Great Books</h1>
    <ul>
        <?php foreach($books as $isbn=>$book) { ?>
             <li><?php echo $isbn; ?></li>
            <li><?php echo $book; ?></li>
        <?php } ?>
    </ul>
</body>
</html>